Compilare: main.cpp: In function 'int main()': main.cpp:33:20: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | ok &= (pos == str.size()); | ~~~~^~~~~~~~~~~~~ main.cpp:32:13: warning: variable '_' set but not used [-Wunused-but-set-variable] 32 | pii _ = expresie(); | ^ main.cpp: In function 'std::pair<long long int, long long int> expresie()': main.cpp:50:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | while(ok && pos < str.size() && str[pos] == '+'){ | ~~~~^~~~~~~~~~~~ main.cpp: In function 'std::pair<long long int, long long int> termen()': main.cpp:66:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 66 | while(ok && pos < str.size() && str[pos] == '*'){ | ~~~~^~~~~~~~~~~~